Facing mortar as well as preparation method and application thereof

Abstract

The invention provides facing mortar as well as a preparation method and application thereof. The facing mortar comprises a bottom layer material and a surface layer material arranged on the surface of the bottom layer material, the bottom layer material comprises a conductive grid material; the surface layer material comprises a mortar material; and the surface layer material is provided with negative charges. The facing mortar provided by the invention can effectively adsorb suspended particles including PM2.5 particles in air, can catalyze decomposition of organic pollutants, effectively improves the air quality, and improves the living standard of people.

Description

Technical Field

[0001] This invention belongs to the field of building materials technology, specifically relating to a decorative mortar, its preparation method, and its application. Background Technology

[0002] PM2.5 has a wide impact and contains harmful organic matter in the air. Finishing mortar is widely used on the interior and exterior surfaces of buildings; if its distribution characteristics could be utilized to reduce air pollution, it could effectively improve the quality of life for residents. However, traditional finishing mortar has a single function and lacks the ability to adsorb PM2.5 particles or decompose organic pollutants (such as VOCs and polycyclic aromatic hydrocarbons), thus failing to improve air quality.

[0003] CN106630897A provides a building exterior wall finishing mortar, which is composed of the following components in parts by weight: 90-100 parts high-alumina cement, 3-5 parts quartz sand, 20-30 parts high-strength gypsum powder, 5-8 parts inorganic pigment, 0.5-0.8 parts wood cellulose, 1.2-1.6 parts magnesium stearate, 1.4-1.8 parts cellulose ether, and 110-120 parts water. This invention's building exterior wall finishing mortar has excellent thermal insulation, waterproofing, and breathability; it is colorfast and has a long service life.

[0004] CN118619638A discloses a highly water-resistant phosphorus-based colored decorative mortar made from phosphogypsum and its preparation method. The mortar comprises the following raw materials by weight and proportion: 50%-90% phosphorus-based building gypsum, 10-50% phosphorus-based high-strength gypsum, 1-2% heavy calcium carbonate powder, 1-3% additives, 5-7% pigment, and water added at 40-50% of the total mass of the phosphorus-based building gypsum, phosphorus-based high-strength gypsum, and heavy calcium carbonate powder. This invention uses phosphorus-based building gypsum and phosphorus-based high-strength gypsum prepared from industrial waste phosphorus-based gypsum as raw materials, which can realize the resource utilization of solid waste and reduce the consumption of non-renewable resources such as natural gypsum.

[0005] CN110937869A discloses a method for manufacturing a high-toughness fair-faced mortar material, comprising the high-toughness fair-faced mortar material composed of the following raw materials: 25-35 parts of sulfoaluminate cement, 30-45 parts of solid waste powder, 8-16 parts of fine aggregate, 2-8 parts of water-reducing agent, 4-8 parts of crack-resistant fiber, 6-9 parts of hydroxypropyl methylcellulose, 1-3 parts of toughening agent, and 15-20 parts of water. This invention employs a novel cementitious material system of sulfoaluminate cement and solid waste powder, altering the properties and dosage of the main materials such as solid waste powder, fine aggregate, and fiber, thereby establishing a high-performance preparation technology for high-toughness mortar. This improves the mechanical properties, volume stability, and durability of the high-toughness fair-faced mortar material, thus addressing the issues of volume stability and strength development stability in high-toughness fair-faced mortar.

[0006] However, none of the above solutions can remove PM2.5 particles and organic pollutants from the air. Therefore, how to provide a finishing mortar that can effectively remove PM2.5 particles and organic pollutants from the air and improve air quality has become an urgent problem to be solved. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the present invention aims to provide a decorative mortar, its preparation method, and its applications. The decorative mortar provided by the present invention can effectively adsorb suspended particulate matter in the air, including PM2.5 particles, and can catalyze the decomposition of organic pollutants, effectively improving air quality and raising people's living standards.

[0008] To achieve this objective, the present invention adopts the following technical solution:

[0009] In a first aspect, the present invention provides a finishing mortar, the finishing mortar comprising a base material and a surface material disposed on the surface of the base material;

[0010] The underlying material includes a conductive mesh material;

[0011] The surface material includes mortar material;

[0012] The surface material carries a negative charge.

[0013] The above solution, by employing a specific base material, enhances the integrity, crack resistance, and electrical conductivity of the mortar. The surface material carries a negative charge, actively adsorbing positively charged suspended particulate matter, including PM2.5 particles, from the air using electrostatic force. Furthermore, because the particles adsorb a large amount of organic pollutants, these pollutants accumulate on the surface of the surface material. The surface material then decomposes these organic pollutants, producing harmless carbon dioxide and water, significantly improving decomposition efficiency. This achieves the decomposition of organic pollutants and surface self-cleaning, restoring adsorption sites and allowing the mortar to continue functioning. Subsequent surface residue can be cleaned simply by sprinkling water or rain, with the residue flowing down to the bottom of the building for recycling. Overall, this solution achieves the simultaneous removal of suspended particulate matter and organic pollutants, effectively improving air quality and raising people's living standards.

[0014] Preferably, the conductive mesh material includes conductive mesh cloth or metal mesh.

[0015] Preferably, the conductive mesh material is made of carbon fiber, metal, flexible graphite composite material, or any one or a combination of at least two of the following: a fabric (e.g., polyester fiber) as the substrate and a metal conductive layer formed on the surface.

[0016] Preferably, the underlying material is connected to a DC power supply.

[0017] The aforementioned DC power supply configuration enables the underlying material to act as an electrode, allowing the mortar surface to carry a continuous negative charge in order to adsorb positively charged suspended particles in the air.

[0018] Preferably, the DC power supply is at 1 m 2 The voltage on the finishing mortar should not exceed 12 V, and the current should not exceed 0.5 mA.

[0019] Preferably, the mortar material comprises, by weight, 12-15 parts cement, 55-75 parts conductive material, 5-10 parts photocatalyst, 4-7 parts latex powder, 0.1-0.2 parts cellulose ether, and 0.3-0.5 parts early strength agent.

[0020] The cement can be in the following proportions: 12 parts, 12.5 parts, 13 parts, 13.5 parts, 14 parts, 14.5 parts, or 15 parts; the conductive material can be in the following proportions: 55 parts, 60 parts, 65 parts, 70 parts, or 75 parts; the photocatalyst can be in the following proportions: 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, or 10 parts; and the latex powder can be in the following proportions: 4 parts, 4.5 parts, 5 parts, 5.5 parts, 6 parts, 6.5 parts, or 7 parts. The amount of cellulose ether can be 0.1 parts, 0.11 parts, 0.12 parts, 0.13 parts, 0.14 parts, 0.15 parts, 0.16 parts, 0.17 parts, 0.18 parts, 0.19 parts, or 0.2 parts, etc., and the amount of early strength agent can be 0.3 parts, 0.35 parts, 0.4 parts, 0.45 parts, or 0.5 parts, etc., but is not limited to the values ​​listed above. Other unlisted values ​​within the above range are also applicable.

[0021] The above solution utilizes conductive materials to enhance the conductivity of mortar materials, thereby achieving more effective adsorption of suspended particulate matter. Combined with a photoelectrocatalyst, it can generate a highly oxidizing substance under sunlight (especially ultraviolet light), which decomposes the organic pollutants adsorbed on the surface into harmless carbon dioxide and water.

[0022] Preferably, the conductive material includes any one or a combination of at least two of conductive mica, conductive powder, conductive fiber, or conductive additives.

[0023] Preferably, the conductive powder includes any one or a combination of at least two of silver powder, copper powder, graphite powder, or nickel powder.

[0024] Preferably, the conductive powder has a mesh size of 100-200.

[0025] Preferably, the conductive fiber includes any one or a combination of at least two of carbon black composite fiber, carbon fiber, or metal fiber.

[0026] Preferably, the conductive additive includes carbon nanotubes and / or graphene.

[0027] Preferably, the conductive material comprises, by weight, 10-16 parts conductive mica, 20-24 parts 190-210 mesh conductive powder, 24-26 parts 240-260 mesh conductive powder, 2-4 parts conductive fiber, and 0.1-0.3 parts conductive additive.

[0028] The conductive mica can be in the following proportions: 10, 11, 12, 13, 14, 15, or 16 parts; the 190-210 mesh conductive powder can be in the following proportions: 20, 21, 22, 23, or 24 parts; the 240-260 mesh conductive powder can be in the following proportions: 24, 24.5, 25, 25.5, or 26 parts; the conductive fiber can be in the following proportions: 2, 2.5, 3, 3.5, or 4 parts; and the conductive additive can be in the following proportions: 0.1, 0.15, 0.2, 0.25, or 0.3 parts. However, these proportions are not limited to the values ​​listed above, and other unlisted values ​​within the above range are also applicable.

[0029] The aforementioned specific conductive materials, combined with other components, can effectively improve the conductivity of mortar materials, thereby enhancing the adsorption and pollutant removal effects of the surface layer materials.

[0030] Preferably, the photocatalyst comprises any one or a combination of at least two of nano-titanium dioxide, nano-zinc oxide, or modified titanium dioxide.

[0031] Preferably, the mortar material further includes 0.1-0.6 parts of pigment by weight, such as 0.1, 0.2, 0.3, 0.4, 0.5 or 0.6 parts, but is not limited to the values ​​listed above. Other unlisted values ​​within the above range are also applicable.

[0032] Preferably, the thickness of the mortar material is 1-5 mm (e.g., 1 mm, 2 mm, 3 mm, 4 mm or 5 mm, etc.).

[0033] The latex powder, cellulose ether, and early strength agent used in this invention are all conventional reagents in the field and can be obtained freely from the market. The applicant does not impose too many restrictions on them.

[0034] Secondly, the present invention provides a method for preparing the finishing mortar as described above, the method comprising the following steps:

[0035] A mortar material is obtained by mixing an early-strength agent, latex powder, cellulose ether, conductive material, photocatalyst, and cement. The mortar material is then coated onto the surface of a conductive mesh material connected to a DC power supply to obtain the finishing mortar.

[0036] Thirdly, the present invention also provides the application of the finishing mortar as described above in the decoration of building exterior walls.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] This invention provides a finishing mortar that, by employing a specific base material, enhances the mortar's integrity, crack resistance, and electrical conductivity. The surface material carries a negative charge, actively adsorbing positively charged suspended particulate matter from the air using electrostatic force. Furthermore, because the particles adsorb a large amount of organic pollutants, these pollutants accumulate on the surface of the surface material. The surface material then decomposes these organic pollutants, producing harmless carbon dioxide and water, significantly improving decomposition efficiency. This achieves the decomposition of organic pollutants and surface self-cleaning, thereby restoring adsorption sites and allowing the mortar to continue functioning. Subsequent surface residue can be cleaned simply by sprinkling water or rain, and the residue is carried by rainwater to the bottom of the building for recycling. Overall, this invention achieves the simultaneous removal of suspended particulate matter and organic pollutants, effectively improving air quality and raising people's living standards.

[0039] This invention employs a dual decomposition technique of adsorption and photoelectric degradation, which has the following effects:

[0040] When energized, the current acts on the material or its supported photoelectrocatalyst, decomposing the adsorbed organic pollutants, thereby restoring the material's adsorption capacity and extending its service life. Its advantages include flexible form and the ability to be used independently. Under the combined action of light and external voltage, the catalytic process of the photoelectrocatalyst is greatly enhanced and directionally controlled, forming a synergistic effect with other conductive components, promoting charge transfer between the electrode, solution (or air), and pollutants, thus accelerating electrochemical redox reactions. This upgrades the product from an inefficient "natural catcher" to a highly efficient and precise "pollutant decomposer." Direct current energization for photoelectrocatalysts represents an upgrade from passive to active catalysis, solving the fundamental bottleneck of charge recombination through an external electric field, thus achieving a comprehensive leap forward in efficiency, controllability, and applicability. Detailed Implementation

[0041] To further illustrate the technical means and effects of the present invention, the following describes the technical solution of the present invention in conjunction with preferred embodiments of the present invention. However, the present invention is not limited to the scope of the embodiments.

[0042] In the following example, the latex powder was purchased from Wacker Chemie (China) Co., Ltd., and the model was VINNAPAS® 5016 N(PRC).

[0043] The cellulose ether was purchased from Yiteng New Materials, model YT-100ME;

[0044] The early strength agent was purchased from Puyang Wangda Chemical Co., Ltd., and its product is calcium formate.

[0045] The conductive mica powder was purchased from Shanghai Deyude Trading Co., Ltd., model number TS-210;

[0046] Nano-titanium dioxide was purchased from Bohuas Nanotechnology (Ningbo) Co., Ltd.;

[0047] The carbon fiber conductive mesh was purchased from Wuxi Heshengyuan Carbon Fiber Technology Co., Ltd., model number 6k;

[0048] The copper conductive mesh was purchased from Shenzhen Futelong Radio Wave Shielding Materials Co., Ltd.

[0049] The carbon black composite fiber was purchased from Haining Taixin New Materials Co., Ltd.

[0050] The carbon fiber was purchased from Jiangsu Aierda Composite Materials Co., Ltd., and its model number is S-231.

[0051] The carbon nanotubes were purchased from Jiangsu Xianfeng Nanomaterials Technology Co., Ltd., model XFS19;

[0052] The graphene was purchased from Jiangsu Xianfeng Nanomaterials Technology Co., Ltd.

[0053] The nano zinc oxide was purchased from Hangzhou Jiupeng New Materials Co., Ltd., model number CY-J50L.

[0054] Example 1

[0055] This embodiment provides a finishing mortar, including a base material and a top layer material disposed on the surface of the base material. The base material is connected to a DC power supply (per 1m). 2 The finishing mortar has an output voltage of 12 V and a current of 0.5 mA, and the underlying material is copper conductive mesh cloth.

[0056] The raw materials for preparing the surface layer material include (in parts by weight):

[0057] 13 parts white cement, 13 parts conductive mica powder, 25 parts 250 mesh copper powder, 22 parts 200 mesh copper powder, 7 parts nano titanium dioxide, 3 parts carbon black composite fiber, 0.2 parts carbon nanotubes, 5 parts latex powder, 0.15 parts cellulose ether, 0.3 parts pigment (iron oxide red), and 0.4 parts early strength agent.

[0058] The preparation method is as follows:

[0059] The measured early strength agent, pigment, cellulose ether, latex powder, carbon nanotubes, carbon black composite fiber, and nano titanium dioxide are mixed to form a masterbatch.

[0060] Turn on the mixer, first add the measured white cement, conductive mica powder, 250 mesh copper powder, and 200 mesh copper powder, then add the masterbatch, mix at 120 rpm for 2 minutes, and then slowly mix for 2 minutes without turning on the mixer and using the fly blades inside.

[0061] Mix at high speed of 240 rpm for 3 minutes, without turning on the fly blades inside the mixer for 3 minutes, and then with the fly blades inside the mixer on for 3000 rpm for 3 minutes to obtain mortar material;

[0062] The mortar material is applied to the surface of the base material (3 mm thick), and after drying, the finishing mortar (1 m thick) is obtained. 2 ).

[0063] Example 2

[0064] This embodiment provides a finishing mortar, including a base material and a top layer material disposed on the surface of the base material. The base material is connected to a DC power supply (per 1m). 2 The finishing mortar has an output voltage of 12 V and a current of 0.5 mA, and the underlying material is carbon fiber conductive mesh.

[0065] The raw materials for preparing the surface layer material include (in parts by weight):

[0066] 13 parts white cement, 13 parts conductive mica powder, 25 parts 250 mesh silver powder, 22 parts 200 mesh silver powder, 7 parts nano zinc oxide, 3 parts carbon fiber, 0.2 parts carbon nanotubes, 5 parts latex powder, 0.15 parts cellulose ether, 0.3 parts pigment (iron oxide red), and 0.4 parts early strength agent.

[0067] The preparation method is the same as in Example 1.

[0068] Example 3

[0069] This embodiment provides a finishing mortar, including a base material and a top layer material disposed on the surface of the base material. The base material is connected to a DC power supply (per 1m). 2 The finishing mortar has an output voltage of 12 V and a current of 0.5 mA, and the underlying material is a copper mesh.

[0070] The raw materials for preparing the surface layer material include (in parts by weight):

[0071] 13 parts gray cement, 13 parts conductive mica powder, 25 parts 250 mesh graphite powder, 22 parts 200 mesh graphite powder, 7 parts nano titanium dioxide, 3 parts carbon fiber, 0.2 parts graphene, 5 parts latex powder, 0.15 parts cellulose ether, and 0.4 parts early strength agent.

[0072] The preparation method is the same as in Example 1.

[0073] Example 4

[0074] This embodiment provides a decorative mortar, which is identical to that in Embodiment 1 except that the raw materials for preparing the surface material do not contain 250-mesh copper powder and 200-mesh copper powder.

[0075] Example 5

[0076] This embodiment provides a decorative mortar, which is identical to that in Example 1 except that the raw materials for preparing the surface material do not contain carbon black composite fibers and carbon nanotubes.

[0077] Example 6

[0078] This embodiment provides a decorative mortar, which is identical to that in Example 1 except that the raw materials for preparing the surface material do not contain conductive mica powder, 250-mesh copper powder, 200-mesh copper powder, carbon black composite fiber and carbon nanotubes.

[0079] Example 7

[0080] This embodiment provides a decorative mortar, which is identical to that in Example 1 except that the raw materials for preparing the surface material do not contain nano-titanium dioxide.

[0081] Comparative Example 1

[0082] This comparative example provides a finishing mortar that is identical to Example 1 except that it does not contain a DC power supply.

[0083] Effect test:

[0084] PM2.5 and formaldehyde removal tests were conducted on the finishing mortars provided in Examples 1-7 and Comparative Example 1. The PM2.5 removal test method and parameters were based on GB / T 18801-2015, specifically as follows:

[0085] 1. The testing environment uses a sealed test chamber with a volume of ≥30m³, and the temperature, humidity, and background particulate matter concentration inside the chamber are strictly controlled. 2. Pollutant generation uses an aerosol generator, such as cigarette smoke generator, to uniformly generate PM2.5 pollutants (particles with a test diameter of 0.3μm or larger) inside the chamber. 3. Test operation: After the initial concentration stabilizes, the finishing mortar is added, the DC power supply is turned on, and the decay change of the particulate matter concentration inside the chamber over time is monitored.

[0086] Formaldehyde removal testing was conducted according to JC / T 1074-2021. The results are as follows:

[0087]

[0088]

[0089]

[0090] The data above shows that, according to experimental tests, the concentrations of PM2.5 and formaldehyde in the decorative mortar provided by this invention decrease significantly over time. Within 7 hours, it can simultaneously reduce high concentrations of PM2.5 and formaldehyde by more than 70%, demonstrating significant effectiveness, especially in the initial stage where the reaction is rapid and can quickly improve air quality. Comparative Examples 1-6 show that, by selecting specific conductive materials, this invention can effectively improve the conductivity of the mortar material in conjunction with other components, thereby improving the adsorption effect and pollutant removal effect of the surface material. Comparative Examples 1, 7 and Comparative Example 1 show that, by using a DC power supply, this invention can give the mortar surface a continuous negative charge, actively adsorbing positively charged PM2.5 particles in the air using electrostatic force and enriching organic pollutants. With the help of a photoelectrocatalyst, the organic pollutants adsorbed on the surface can be decomposed into harmless carbon dioxide and water.

[0091] The applicant declares that this invention illustrates the decorative mortar, its preparation method, and application through the above embodiments, but the invention is not limited to the above embodiments, that is, it does not mean that the invention must rely on the above embodiments to be implemented. Those skilled in the art should understand that any improvements to this invention, equivalent substitutions of the raw materials of the product, additions of auxiliary components, and selection of specific methods, etc., all fall within the protection and disclosure scope of this invention.

[0092] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0093] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

Claims

1. A finishing mortar, characterized in that, The decorative mortar comprises a base material and a surface layer material arranged on the surface of the base material; The base material comprises an electrically conductive grid material; The surface layer material comprises a mortar material; The surface layer material is negatively charged.

2. The render mortar according to claim 1, characterized in that The electrically conductive grid material comprises an electrically conductive grid cloth or a metal mesh; Preferably, the material of the electrically conductive grid material comprises any one or a combination of at least two of carbon fiber, metal, flexible graphite composite material, or fiber with fabric as a base material and a metal conductive layer formed on the surface; Preferably, the base material is connected to a direct current power supply.

3. The render mortar according to claim 2, characterized in that The direct current power supply is not higher than 1 m 2 The voltage on the finishing mortar is not higher than 12 V, and the current is not higher than 0.5 mA.

4. A render mortar according to any one of claims 1 to 3, characterised in that, The mortar material comprises, in parts by weight, cement 12-15 parts, electrically conductive material 55-75 parts, photoelectric catalyst 5-10 parts, latex powder 4-7 parts, cellulose ether 0.1-0.2 parts, and early strength agent 0.3-0.5 parts.

5. The render mortar according to claim 4, characterized in that The electrically conductive material comprises any one or a combination of at least two of electrically conductive mica, electrically conductive powder, electrically conductive fiber, or electrically conductive additive; Preferably, the electrically conductive powder comprises any one or a combination of at least two of silver powder, copper powder, graphite powder, or nickel powder; Preferably, the electrically conductive powder has a mesh size of 100-200 mesh; Preferably, the electrically conductive fiber comprises any one or a combination of at least two of carbon black composite fiber, carbon fiber, or metal fiber; Preferably, the electrically conductive additive comprises carbon nanotubes and / or graphene; Preferably, the electrically conductive material comprises, in parts by weight, electrically conductive mica 10-16 parts, electrically conductive powder of 190-210 mesh 20-24 parts, electrically conductive powder of 240-260 mesh 24-26 parts, electrically conductive fiber 2-4 parts, and electrically conductive additive 0.1-0.3 parts.

6. A render mortar according to claim 4 or 5, characterised in that, The photoelectric catalyst comprises any one or a combination of at least two of nano-titanium dioxide, nano-zinc oxide, or modified titanium dioxide.

7. A render mortar according to any one of claims 4 to 6, characterised in that, The mortar material further comprises, in parts by weight, pigment 0.1-0.6 parts.

8. A render mortar according to any one of claims 1 to 7, characterised in that, The thickness of the mortar material is 1-5 mm.

9. A method of preparing a finishing mortar according to any one of claims 1-8, characterized in that, The preparation method comprises the following steps: Mixing and stirring the early strength agent, latex powder, cellulose ether, electrically conductive material, photoelectric catalyst, and cement to obtain a mortar material, and then coating the mortar material on the surface of the electrically conductive grid material connected to the direct current power supply to obtain the decorative mortar.

10. Use of the decorative mortar according to any one of claims 1-8 in the decoration of building exterior walls.

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